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In order to meet the second objective of the catalog as defined in the introduction, it is necessary to take measures to deal with the fact that the names of creators and corporate bodies can vary and change over time.

If an identifier has already been created in the catalog for a particular person or corporate body, use that identifier for all subsequently acquired works that are by or about that person or corporate body. If the identifier for a person or corporate body changes over time, change each normalized ocurrence of the identifier throughout the catalog.